Abnormal combustion detection method for internal-combustion engines from combustion indicator distribution modelling
First Claim
1. A method for controlling combustion of a spark-ignition internal-combustion engine, wherein at least one signal representative of a state of the combustion is recorded by at least one detector in the engine, and at least one indicator of the combustion at each engine cycle is determined from the signal for each engine cycle comprising:
- modelling a distribution of N combustion indicator values acquired over N cycles preceding a cycle in progress, by determining coefficients of a theoretical distribution law;
repeating the modeling by removing values from among the N combustion indicator values or repeating the modeling for working points of the engine, to obtain an evolution of coefficients;
determining at least one parameter representing an evolution of at least one of the coefficients;
determining a frequency of abnormal combustions occurring during the N cycles preceding the cycle in progress by comparing the at least one parameter with a threshold; and
controlling a course of the abnormal combustion detected in the combustion chamber.
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Abstract
An abnormal combustion detection method for spark-ignition internal-combustion engines, from combustion indicator distribution modelling is disclosed. At least one combustion indicator such as CA10 is determined. The distribution of N values of this indicator, acquired over N cycles preceding the cycle in progress, is modelled by determining coefficients of a theoretical distribution law. Modelling is repeated by removing extreme values from among the N values or for various working points of the engine, to obtain an evolution of the coefficients. At least one parameter characterizing evolution of at least one of these coefficients is determined. The start of an abnormal combustion is detected by comparing the parameter with a predetermined threshold, and the course of the abnormal combustion detected in the combustion chamber is controlled.
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Citations
32 Claims
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1. A method for controlling combustion of a spark-ignition internal-combustion engine, wherein at least one signal representative of a state of the combustion is recorded by at least one detector in the engine, and at least one indicator of the combustion at each engine cycle is determined from the signal for each engine cycle comprising:
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modelling a distribution of N combustion indicator values acquired over N cycles preceding a cycle in progress, by determining coefficients of a theoretical distribution law; repeating the modeling by removing values from among the N combustion indicator values or repeating the modeling for working points of the engine, to obtain an evolution of coefficients; determining at least one parameter representing an evolution of at least one of the coefficients; determining a frequency of abnormal combustions occurring during the N cycles preceding the cycle in progress by comparing the at least one parameter with a threshold; and controlling a course of the abnormal combustion detected in the combustion chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification